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VW. H. BURNHAM 8; J. H. MILLER.

' GOMPENSATING PUMP ROD.

No. 428,800. Patented May 27, 1890.

UNITED STATES PATENT ()FFICE.

\VILLIAM HENRY BURNHAM AND JOHN H. MILLER, OF BATAVIA, ILLINOIS,

ASSIGNORS T THE UNITED STATES \VIND ENGINE AND PUMP COM- PANY, OF SAME PLACE.

COMPENSATING PUMP-ROD.

SPECIFICATION forming part of Letters Patent No. 428,800, dated May 27, 1890.

Application filed March I7, 1890- Serial No. 344,137. (No model.)

To all whom it may concern.-

Be it known that we, WILLIAM HENRYBURN- HAM and JOHN H. MILLER, citizens of the United States, residing at Batavia, in the county of Kane and State of'lllinois, have invented a certain new and useful Improvement in Compensating Pump-Rods, which is fully set forth in the following specification, reference being had to the accompanying 1o drawings, in which Figure 1 represents a vertical sectional view of our invention; Fig. 2, a perspective view of one of the coupling-irons. Fig. 3 is a transverse sectional view taken at the line 3 3,

Fig. 1; and Fig. 4 is a view of one of the washers detached.

The object of this invention is to prevent pumps, when obstructed, from being injured by the action of the pump-rod driven by non-yielding power, such as windmills. The means which we use for accomplishing this purpose consists of atwo-part pump-rod with a spring placed'between separate ends, giving an elasticity to the pump-rod which pre- 2 5 vents breakage to a large degree in case of an obstruction in the pump.

Our invention consists of the special const-ruction of the devices with which the two parts of the pump-rod are coupled together 0 and the devices which serve to keep the spring in place, as hereinafter fully described.

A represents the coupling strap, which is secured by bolts or other suitable attaching devices to one portion of the pump-rod B. O

3 5 is the coupling-strap attached to the other end of the pump-rod, which is represented by D. These metal straps form a loop projecting beyond the respective ends of the parts of the pump-rods to which they are attached,

40 in which the coil-spring E is placed. The

coupling-strap O is within the loop of the coupling-strap A, as clearly shown in Fig. 1, so that the coupling-straps form a chamber which contains the spring. At each end of the spring there is a washer F,whichisloose and movable within the chamber formed by the coupling-straps A and C.

G are set-screws passing through the ends of the coupling-straps, by which the washers are set up to increase the tension of the spring 0 E between washers.

The looped coupling-straps which couple the two parts of the pump-rod together, by their construct-ion, have between their looped ends the spring E, so held in position by the 5 5' washers that the power applied to the pumprod compresses the spring, and whenever any obstruction occurs in thepump the spring gives an elasticity to the rod, which largely prevents breakage. The set-screws placed behind the washers regulate the tension of the spring as desired.

This invention is an improvement on our compensating pump-rod patented by us April 17, 1888, No. 381,211.

To claim as new and desire to secure by Letters Patent 1. In cushioned pump-rods, the couplingstraps A and G, the pump-rods B and D, and spring E within the looped ends of the pumprod couplers, substantially as specified and shown.

2. In cushioned pump-rods, the couplingstraps A and 0, spring E, washers F, and setscrews G, substantially as specified and shown. 7 5

I/VILLIAM HENRY BURNHAM. JOHN H. MILLER. IVitnesses:

GEORGE O. SPOONER, ISAAC R. Woon. 

